fixed EDU-271 Pycharm Educational doen't resolve stacktraces in Run window

added PythonTracebackFilter to content executor
(cherry picked from commit 6cad5c2)
EDU-294 Wrong text encoding for answer placeholders
(cherry picked from commit e58c01b)
fixed encoding problems
(cherry picked from commit 9664c0b)
update course for version 1.0.1
(cherry picked from commit 20ee041)